Catalyst Electrode and Method for Manufacturing Catalyst Electrode

Abstract

A catalyst electrode including a metal layer and a catalyst layer formed on the metal layer is provided. The catalyst layer includes iridium and palladium. A membrane electrode assembly and a method for manufacturing a catalyst electrode are also provided.

What is claimed is: 
     
         1 . A catalyst electrode comprising:
 a metal layer; and   a catalyst layer formed on the metal layer,   wherein the catalyst layer comprises iridium and palladium.   
     
     
         2 . The catalyst electrode according to  claim 1 , wherein at least a part of the iridium and palladium comprised in the catalyst layer is chemically bonded with each other. 
     
     
         3 . The catalyst electrode according to  claim 1 , wherein iridium contained in the catalyst layer at a loading amount ranging from 0.02 to 0.8 mg/cm 2 , and palladium contained in the catalyst layer at a loading amount ranging from 0.1 to 0.9 mg/cm 2 . 
     
     
         4 . The catalyst electrode according to  claim 1 , wherein the metal layer comprises one or more selected from the group consisting of a metal mesh, metal foam, metal foil, metal felt, and a metal fiber. 
     
     
         5 . The catalyst electrode according to  claim 4 , wherein the metal of the metal layer comprises one or more metals or metal alloy selected from the group consisting of titanium, nickel, and stainless steel. 
     
     
         6 . The catalyst electrode according to  claim 1 , wherein the iridium and palladium are electrochemically deposited on the metal layer. 
     
     
         7 . The catalyst electrode according to  claim 1 , wherein the iridium and palladium are in direct contact with the metal layer. 
     
     
         8 . The catalyst electrode according to  claim 7 , wherein the catalyst layer does not comprise a binder. 
     
     
         9 . A method for manufacturing a catalyst electrode, the method comprising a step of depositing iridium and palladium on a metal substrate. 
     
     
         10 . The method according to  claim 9 , wherein the step of depositing iridium and palladium on a metal substrate comprises:
 a step of inputting the metal substrate to a solution comprising an iridium precursor and a palladium precursor; and   a step of electrochemically depositing the iridium and palladium on the metal substrate.   
     
     
         11 . The method according to  claim 10 , wherein at least a part of the iridium and palladium deposited on the metal substrate are chemically bonded with each other. 
     
     
         12 . The method according to  claim 10 , wherein the step of electrochemically depositing the iridium and palladium on the metal substrate is performed by applying a voltage through one or more electrodes in contact with the solution. 
     
     
         13 . The method according to  claim 12 , wherein the voltage is increased at a constant rate. 
     
     
         14 . The method according to  claim 9 , further comprising: a step of heat-treating the metal substrate with the deposited iridium and palladium. 
     
     
         15 . The method according to  claim 9 , further comprising a step of acid-treating the metal substrate before the step of depositing iridium and palladium on the metal substrate. 
     
     
         16 . A membrane electrode assembly, comprising:
 an electrolyte membrane;   an anode positioned on one surface of the electrolyte membrane; and   a cathode positioned on the other surface of the electrolyte membrane,   wherein the anode comprises:
 a metal layer; and 
 a catalyst layer formed on the metal layer and comprising iridium and palladium.